Answer:
1.) Río de la Plata
2.) Central Argentina. Patagonia is a region of dry plains and plateaus south of the Pampas. These plains rise in the west to form the Andes Mountains.
3.) The Amazon River is the greatest river in South America because of its drainage system (in terms of the volume of it's flow and the area of its basin).
4.) Deforestation has become an issue that threatens the resources of the rain forest.
5.) Atlantic South America has many climates. Southern and highland areas have cool climates while northern and coastal areas have tropical and moist climates. Patagonia has a cool, desert climate. To the north in the Pampas, the climate is humid subtropical.
Sources: www.norwellschools.org/cms/lib02/MA01001453/.../Atlantic%20Physical%20Geo.pdf